Mental mind sets are making a choice in your head to do something, set a goal or some sort of achievement to do something.  Mentally  you have to believe you can do it though to have a successful mind set

This happened to my dog when we gave her a haircut and the lady who cut her hair suggested to take an old t-shirt and put it on my dog to warm her up or you could just give her/him some love and give a good old fashion tummyrub